Hanna (Ronan) is a teenage girl. Uniquely, she has the strength, the stamina, and the skills of a soldier; these come from being raised by her father (Bana), an ex-CIA man, in the wilds of Finland. Living a life unlike any other teenager, her upbringing and training have been one and the same, all geared to making her the perfect assassin. The turning point in her adolescence is a sharp one; sent into the world by her father on a mission, Hanna journeys stealthily across Europe while eluding...

As the curtain rises, Hannah hesitantly steps onto the stage for her theatrical debut in college. Yet before she can utter her first lines, Hannah-unscripted-collapses in front of the stunned audience. After countless medical tests, all signs point to one underlying factor: Hannah's difficult birth. This revelation is nothing compared to what she then learns from her parents: she was actually adopted ... after a failed abortion attempt. Bewildered, angered, and confused, Hannah turns for support...